=Example of Induction.=--As an example of induction, may be taken the solution of such a problem as, "Does air exert pressure?" To meet this hypothesis we must evidently do more than merely abstract the manifest properties of an object, as is done in ordinary conception, or appeal directly to some known general principle, as is done in deduction. The work of induction demands rather to examine the two at present known but disconnected things, _air_ and _pressure_, and by scientific observation seek to discover a relation between them. For this purpose the investigator may place a card over a glass filled with water, and on inverting it find that the card is held to the glass. Taking a glass tube and putting one end in water, he may place his finger over the other end and, on raising the tube, find that water remains in the tube. Soaking a heavy piece of leather in water and pressing it upon the smooth surface of a stone or other object, he finds the stone can be lifted by means of the leather. Reflecting upon each of these circumstances the mind comes to the following conclusions: Air pressure holds this card to the glass, Air pressure keeps the water in the tube, Air pressure holds together the leather and the stone, .'. Air exerts pressure. =How Distinguished from, A. Deduction, and B. Conception.=--Such a process as the above constitutes a process of reasoning, first, because the conclusion gives a new affirmation, or judgment, "Air exerts pressure," and secondly, because the judgment is supposed to be arrived at by comparing other judgments. As a process of reasoning, however, it differs from deduction in that the final judgment is a general judgment, or truth, which seems to be based upon a number of particular judgments obtained from actual experience, while in deduction the conclusion was particular and the major premise general. It is for this reason that induction is defined as a process of going from the particular to the general. Moreover, since induction leads to the formation of a universal judgment, or general truth, it differs from the generalizing process known as conception, which leads to the formation of a concept, or general idea. It is evident, however, that the process will enrich the concept involved in the new judgment. When the mind is able to affirm that air exerts pressure, the property, exerting-pressure, is at once synthesised into the notion air. This point will again be referred to in comparing induction and conception as generalizing processes.